in that first example
MyApp.country = Ember.Object.create({
// Ending a property with 'Binding' tells Ember to
// create a binding to the presidentName property.
presidentNameBinding: 'MyApp.president.name'
});

MyApp.country.get('presidentName');

where is 'presidentName'? I see only 'presidentNameBinding' on country object.

Other than above, I thank you all for your efforts bringing this framework, and wish you a happy & peaceful new year 2012